L.
There are Community Health dental clinics in Providence--www.providencechc.org. I am from San Francisco and there were clinics that were run by a university that had a doctoral program for dentistry. There must be something like that here or in nearby MA or CT. It was a very inexpensive way to have dental care and even though the dentists were students, they had been through many years of training before they actually got to touch live people...and, they were well supervised and I never had any problems with their work. Good luck!